John w



(No Model.)

J. W. SPOLDERS & F. X. VIEN.

SAFETY VALVE. No. 892,469. Patented Nov. 6, 1888.

y WITNESSES: 'INVENTOR:

16% BY M m ATTORNEYS;

UNITED STATES PATENT JOHN WV. SPOLDERS AND FRANCIS X. VIl lN, OFBROOKLYN, NIll/V YORK.

SAFETY=VALVE.

SPECIFICATION forming part of Letters Patent No. 392,469, dated November6, 1888. Application filed September 2, 1886. Serial No. 212.448. (Nomodel.)

To all whom it may concern:

Beit known that we, J OHN W. SPoLDERs and FRANCIS X. VIEN, both of thecity of Brooklyn, in the county of Kings and State of New York, haveinvented a new and Improved Safety-Valve, of which the following is afull, clear, and exact description.

The object of our invention is to provide a new and improvedsafety-valve which is simple in construction, very effective inoperation, and not liable to get out of order.

The invention consists of various parts and details and combinations ofthe same, as will be fully described hereinafter, and then pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure 1 is a plan view of our improvement, parts being in section. Fig.2 is a sectional elevation of the same.

The pipe A, which is connected in any suit able manner with the boiler,is provided on its top with a flat seat, B, on which rests a valve, 0,having on its bottom a central projection, I). which directs the steamtoward the brackets A, attached to the pipe A. The bolts I are held inplace by nuts J. On the bolt G is formed a collar, G between which andthe lever H is held the bell-shaped cover K,which protects the centralprojection, E, from dust.

It will be seen that when the steam-pressare in the boiler exceeds butslightly the limit to which the safety-valve is set,then the pressure ofthe steam raises the valve 0, as very little friction has to be overcomebetween the seat B and its contacting valve 0, on account of the flatvalve and its flat seat. At the same time the friction on the fulcrum ofthe lever His reduced to a minimum on account of the pointed bolts I onwhich the lever H swings, and as there is no pivotal joint between thelever H and the valve 0, but simply a contacting point, hardly anyfriction exists between these two parts.

As soon as the pressure of the steam in the boiler has fallen to itsnormal pressure the valve 0 is centrally seated on the pipe A by theaction of the lever H and its pointed bolt G. Thus it will be seen thatthe valve will al ways act at the slightest excessive pressure of steam,as all the contacting points offer very little resistance.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

1. In a safety-valve, the combination, with the pipe A, having the flatseat B, of the valve G, fitted to the seat B and provided with a centralrounded projection, D, on its bottom, and having a comically-shapedrecess in its top, the lever H, and the pointed bolt G G, secured to thelever and projecting into the recess of the valve, substantially asherein shown and described.

2. In a safety valve, the combination of the valve G, having on its topthe central projection, E, with the bolt G attached to the lever H, andthe bell-shaped cover K, substantially as shown and described.

3. In a safety-valve, the pipe A, having the flat seat B. and the valve0, provided on its top with the central projection, E, having theconical recess F, and the central projection, D, on the bottom of thevalve 0, in coznbination with the bolt G, the pointed end G of whichengages the said conical recess F, the lever H, carrying the said boltG, the pointed bolts I, forming a fulcrum for the said lever H, and thecover K, attached to the bolt G, substantially as shown and described.

JOHN W. SPOLDERS. FRANCIS X. VIEN.

Witnesses:

THEo. G. HOSTER, G. SEnewIoK.

